I switched from sgminer-gm 5.5.5 to xmr-stak 2.2.0 and tweaked amd.txt as suggested by @Vlizzjeffrey and I'm getting 1370 H/s out of (3) 2GB XFX RX 560 cards. That's exactly the same as with sgminer, but it seems a lot more stable. The specific problem I was having with sgminer is it would lock the rig up so bad it needed to be hard reset, usually, but not always, when I used the KVM switch to select it after it had been running awhile. Note that I am using the integrated GPU in the Celeron CPU for video, and not one of the mining cards, so this behavior was quite perplexing.
Do not use iGPU with AMD! Bad idead, it blocks OC settings, might be fixed with newer drivers, but it was big problem for most cards for mining. Only with Nvidia cards.
Properly configured SGminer has a lot higher hashrate than XMR-STAK 2.2 even older XMR-STAK-AMD has higher hashrate than 2.2. I've compiled latest sources from XMR-STAK it's in my guide for download, it has slightly higher hashrate but still older AMD version is better, also it has lowered dev fee to 1%.
Guys, which version is the old Stak with good results please ?
For the moment I can't equal sgminer results (500+h/s with 2 threads) when I try stak with two threads too. I tried 2.2 , 2.0 and 1.1.0.
I get approximatively the same hashrate with all the stak versions I tried (460h/s), but still less than sg miner.
I guess I missed the righ stak version. Anyone reaching good number with Stak could tell me which version he use ?
Thanks a lot!